Η σχετική αποτελεσματικότητα του συντελεστή βήτα
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Keywords
Συντελεστής βήτα ; CAPM ; Μετοχές ; ΧαρτοφυλάκιαAbstract
When applying the Capital Asset Pricing Model (CAPM), it is custom practice to use monthly data (returns) in order to estimate the betas of the stocks versus a market index, for which a value weighted stock index is used as a proxy.
In this dissertation we evaluate the estimates of betas produced by monthly, weekly and daily data for the markets of United Kingdom and Spain. In the absence of equally weighted indexes with sufficient history we could not evaluate whether some equally weighted index would be better than the value weighted index used.
In the case of United Kingdom the weekly data seem to lead to better betas’ estimates, while in Spain’s case the monthly frequency seems more appropriate.